Fountain pen



FIG. 1 is a front elevational view of a fountain pen showing my new design;

FIG. 2 is a rear elevational view;

FIG. 3 is an enlarged scale elevational view of the nib end;

FIG. 4 is an enlarged scale elevational view of the opposite end;

FIG. 5 is an enlarged scale fragmentary top plan view of the nib end;

FIG. 6 is a front elevational view thereof; and

FIG. 7 is a bottom plan view thereof. 

The ornamental design for a fountain pen, as shown and described. 